make the exact tool you need.
build calculators, converters, timers, pickers, and tiny utilities instead of searching for one that is almost right.
what interactive tool can an agent make for me?
01 / what this issearching for a small tool is a worse experience than it was ten years ago. the first page of results is five sites with the same calculator, each wrapped in advertising, a cookie dialogue and a newsletter prompt, and none of them does the specific variant you wanted — the tip split that accounts for the one person who did not drink, the converter that knows the two units you actually use, the timer with your intervals in it.
asking for one takes about as long as searching for one, and you get the variant you meant. these are the smallest recipes in the library: one job, one screen, no data to speak of, and usually no storage at all. that makes them the best things to build first if you have never done this — the whole loop, from asking to a url you can open on your phone, takes a couple of minutes.
most of them store nothing, which means there is nothing to lose and nothing to sync; each page says which. they are also the recipes where a url matters most, because a tool you cannot find again is a tool you will search for from scratch next time — claim the page, give it a slug you will remember, and put it on your home screen.
in this cluster.
02 / 7 recipessplit it the way you actually split it.
split a real bill, including the person who did not drink
the repayment, and what changes it.
calculate repayments and total interest with every assumption visible
the one calculation you keep doing.
turn a calculation you keep redoing into a proper page with inputs
only the units you use.
convert the few units you actually use, without navigating a menu
pick one, fairly, in front of everyone.
draw a name from your own list, visibly and without repeats
a code you make yourself.
generate qr codes locally, without sending the content anywhere
twenty-five minutes, then stop.
run focus intervals with your own lengths and nothing else on screen
questions.
03 / questionswhy not just use an existing calculator online?
use one if it does what you want. these are for when it does not: the wrong rounding, the missing field, the unit nobody supports, the four ads. a page you had made does your version, has nothing on it but the tool, and is at a url you chose.
do these store anything?
mostly nothing — you type, it computes, you close the tab. where a tool genuinely needs to remember something, like a timer’s preset or a list of names, it keeps that in your own browser and the page says so. nothing is sent to us either way.
how long does one of these take to make?
a couple of minutes, usually one message. these are the cheapest recipes here, which makes them the sensible first thing to try if you have never had an assistant build you something and want to see the whole loop end to end.
can i keep it on my phone?
yes — open the url and use your browser’s add to home screen, which gives you an icon that opens it full screen. that is your browser’s feature rather than ours, and it is still a web page, but for a tool you use weekly it is the difference between finding it and searching again.